5. What are the four main categories of exoplanets identified by astronomers?
- A) Hot Jupiters, Cold Jupiters, Earth Twins, Rogue Planets
- B) Gas Giants, Neptunian, Super-Earths, Terrestrial
- C) Dwarfs, Pulsars, White Dwarfs, Red Giants
- D) Ice Worlds, Carbon Worlds, Water Worlds, Rocky Worlds
Answer: B) Gas Giants, Neptunian, Super-Earths, Terrestrial
These four categories reflect mass and composition: gas giants (like Jupiter), Neptunian (smaller gas/ice worlds), super-Earths (larger rocky planets), and terrestrial (Earth-like rocky planets).
6. How are exoplanets scientifically designated once discovered?
- A) After the astronomer who discovered them
- B) By assigning them mythological names
- C) By adding a lowercase letter to the parent star’s name, starting with “b”
- D) With sequential numbers based on discovery order across all stars
Answer: C) By adding a lowercase letter to the parent star’s name, starting with “b”
The star keeps its original name, and planets are labeled “b,” “c,” “d,” etc., in order of discovery.
7. True or False: Most confirmed exoplanets are located within a small region of the Milky Way galaxy, within a few thousand light-years of our Sun.
Answer: A) True
Most exoplanets detected so far lie relatively nearby in our galaxy, because our instruments can’t yet probe across its vast scale.
8. What is the primary advantage of placing telescopes like JWST, HWO, and Roman at the Sun–Earth L2 Lagrange Point?
- A) It provides free orbital energy, so they never need course corrections
- B) It offers a stable thermal environment and an unobstructed, continuous view of the cosmos
- C) It allows telescopes to orbit the Sun faster than Earth, shortening observation time
- D) It places them in Earth’s shadow, blocking sunlight completely
Answer: B) It offers a stable thermal environment and an unobstructed, continuous view of the cosmos
At L2, telescopes avoid Earth and Moon shadows, stay cool, and can continuously observe deep space with minimal interference.